It seems you are mistaken. Edison championed DC. Tesla invented the power transformer and advocated AC so that power could be distributed at very high voltages and then transformed to lower voltages for use by the customer.
Transmitting power through the air was his unrealized dream, one he demonstrated at small scale. This is where "Tesla Coils" originated. Realistically speaking, this will not work in a practical manner and would cause dangerous side affects in the ambience.
No - I meant Tesla was wrong about tgransmitting power through the air instead of via transmission wires. I thought in context that was clear, since I also said DC CANNOT be transmitted through the air - which Tesla knew - and I was talking not about the argument between DC and AC but the argument between through-wire and through-air transmission.
Like I said up front. There is more than one question hanging in the original question and I chose two aspects of it.